import java.math.BigDecimal;

/**
 * @Author: ycy
 * @CreateDate: 2019/1/30 15:20
 */
public class Mathematical {

  public static void main(String[] args) {

    double a = 1;
    double b = 0.9;
    System.out.println(a-b);


    double c = 1;
    double d = 0.9;
    System.out.println(c-d);


    double src = 64.60;
    System.out.println(src*100);
    System.out.println(BigDecimal.valueOf(src).multiply( BigDecimal.valueOf(100)).doubleValue());


  }

}
